Mick

"He doesn't talk much."

-Liz about Mick

He is the father of Bree and Mya. He is friends with Liz. He is probably a doctor since he helped Lia after being shot.

Season 1
He is seen with Liz helping Lia with her gunshot wound. Afterwards his daughter Bree died after the group made them leave from the zombie herd. He usually just follows the group without talking much.

Season 2
He is mostly in his room most likely going through a depression. Liz then finds him with a gunshot wound in his head.

Death
He has either shot himself in his head or was shot by the man. It is not yet known.

Post-Death
Liz tries to kill herself after finding out about his death.